As at least one person wants to know, here's what I know about 4.3.8842:
- New home screen. But, this is not be enabled for all people and devices.
- Series sorting in the library lists. When selected, the books are sorted as if the series and series index was added to the start of the title.
- Search on home screen remembers the last search used.
- Buttons on the brightness slider changes the level by 1%.
- Nightmode option via config file. This is not a supported feature and might never be.
I don't know of any particular bugs being fixed.
There are no changes that affect the use with calibre. I have updated the driver to accept the new firmware version. This should be in the next calibre release. In the meantime, it is safe to use the "Attempt to support newer firwmare" option.